464641 The Effect of Centralized Energy Storage on an Integrated Distributed Photovoltaics/CHP System for District Power, Heating and Cooling
In our previous work , we provided a framework for simultaneous optimization of design and operation strategy for a CHP plant, providing the ability to select equipment sizes as well as plant operation modes to meet the projected electricity, heating, and cooling demand of a residential neighborhood. Based on realistic data collected from Pecan Street Research Inc., our results revealed that in the seasons with low electricity and cooling demand (winter and spring, considering a predominantly cooling climate), rooftop photovoltaic generation may exceed the neighborhood demand, while in the warmer seasons, the cooling capacity can often exceed the system’s needs.
Motivated by the above, in this paper, we study the same system operating in an islanded (i.e., grid-disconnected) mode, and consider the impact of a centralized energy storage facility on system design and operations. We discuss an extension of our formulation for simultaneously optimizing the design and operation of the CHP plant and the centralized energy storage to minimize the capital and marginal costs of the CHP plant including transition penalties accrued by the equipment turning on and off. Using the aforementioned data collected from a neighborhood located in Austin, TX, we investigate the benefits of energy storage relative to the level of photovoltaic integration from the neighborhood, as well as identify economic benefits from photovoltaic integration and energy storage in terms of plant savings.
 CAISO (2016). What the duck curve tells us about managing a green grid. https://www.caiso.com/Documents/FlexibleResourcesHelpRenewables_FastFacts.pdf
 Ondeck, A.D., Baldea, M., Edgar, T.F. Simultaneous Optimization of Design and Operation Strategies for CHP Systems. Computers & Chemical Engineering. Manuscript in preparation.